Hi Shivam,
The parameter is only passed from the Python to the C++ world on object
construction. Hence, your change never makes it into the actual C++ objects.
If you checkpoint and restore it should work, as the objects actually get
re-created then.
Typically, the DFS would take place inside the simulated system, and not in the
orchestrating Python code, thus our choice of API.
I hope that makes it more clear.
Andreas
From: Shivam Agarwal
<[email protected]<mailto:[email protected]>>
Reply-To: gem5 users mailing list
<[email protected]<mailto:[email protected]>>
Date: Wednesday, 16 October 2013 10:07
To: gem5 users mailing list <[email protected]<mailto:[email protected]>>
Subject: [gem5-users] Problem in dynamically changing the cpu clock values
Hi
I am trying to change the clock frequencies of the different cores dynamically.
I begin with boot up process in atomic mode and then at checkpoint restore move
to detailed mode. To implement dynamic frequency scaling, I added function in
/configs/common/Simulation.py that calls a pre-defined switching function in
src/python/simulate.py as shown below:
def switchcpufreq(root, system, f1, f2, num, do_drain=True):
from m5 import options
if do_drain:
drain(system)
system.cpu[0].clock= f1
system.cpu[1].clock= f2
if do_drain:
resume(system)
In simulation.py the calling function is :
if options.switch_freq:
m5.stats.dump()
m5.stats.reset()
#warmup instruction count may have already been set
if options.warmup_insts:
exit_event = m5.simulate()
else:
exit_event = m5.simulate(options.switch_freq)
print "Switching CPUfreq @ tick %s" % (m5.curTick())
m5.stats.dump()
m5.stats.reset()
m5.switchcpufreq(root, testsys, f1, f2, factor3, factor4, np)
So, the problem here is that it updates the clock frequencies in the
simulation.py file but does not reflect it in the simulation output statistics
(sim_seconds). I feel that the clock is not getting updated in the C++ Object
instantiation.
Kindly help.
Regards
Shivam Agarwal
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